I went to Albany Aquarium, home depot, and then all the usual aquarium store websites and couldn't find a 3/8 inch barbed ball valve. Smallest was a Two Little Fishies 1/2" valve, or the next one I could find is a 1/4" valve. On amazon, I found a $17 valve, made of PVC that is 3/8". Seems kind of ridiculously expensive for something that's just 1/8 smaller than the $4.50 TLF valve. I priced out step up barbed adapters and clamps so I could use that cheaper TLF valve, but it was more expensive than just getting the $17 one. Any ideas where I can find one? I'm just trying to restrict a little 80gph canister filter pump (ZooMed Nano 10) a little so that my poor betta fish doesn't die of exhaustion in his 2.6 gallon tank.